Design and Experiment of Self-propelled Harvester for Forest Understory Panax Pseudoginseng
Aiming at the difficulties of manual harvesting and the lack of mechanical harvesting of Yunnan understory panax pseudoginseng(Panax pseudoginseng),a self-propelled understory panax pseudoginseng harvesting machine powered by a 9.6 kW single-cylinder air-cooled diesel engine was designed,which mainly consists of an engine,a digging shovel,and a lifting sieve,and so on.The force analysis and graphical method were used to analyze the digging shovel,and the digging inclination angle of the shovel was determined to be 20 °,and the shovel length was 305 mm.The design parameters of the lifting sieve were determined through design and calculation of the conveying and separating device,and the linear speed of the lifting sieve was 1.2 m·s-1,the lifting inclination angle was 30°,and the amplitude of the shaking wheel was 2 mm,the rotational speed was 200 r·min-1,and the frequency of the shaking wheel was 10 Hz.Taking the number of teeth of digging shovel,working speed,penetrating angle of digging shovel as the influencing factors,the to simulate the size of the resistance of the digging shovel as the test index,the three factors and three levels orthogonal tests were carried out using EDEM discrete element simulation software and analyzed using Design-expert.And the optimal parameter combinations of the digging shovel are obtained that the number of shovel teeth is 6,the working speed is 0.8 m·s-1,and the penetrating angle of the digging shovel is 25 °.The prototype of the harvester was developed and trial testing was carried out.The results showed that the prototype operation is stable,and the operational performance can satisfy the preliminary design requirement of the harvester,the digging shovel has a better soil breaking performance,the harvester has a lower root injury rate and lower loss,the harvesting productivity is 0.149 hm2·h-1.
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